Interrupter mechanism for ignition-dynamos.



A. 6. DE LOHME.

INTERRUPTER MECHANISM FOR IGNIHUN DYNAMOS.

APPUCATiON min nmzo. l9l6.

1,270,385. Patented June 25, 1918.

IN VEN TOR. WITNESSES ALFRED c105 LOEME. 2Z, BY

1 I w 1m E I UNITED STATES NT OFFICE.

ALFRED CHINA. DE LOBME, OF NEWARK, NEW JERSEY, ASSIGNOR TO SPLITDORF ELECTRICAL COMPANY, A CORPORATION OF NEW JERSEY.

m'mmtor'rma. Mncnamsm FOR IGNITION-DYNAMICS.

Specification of Letters Patent. Patented J line 25, 19,18.

. Application flied April 20, 1916, Serial 110.923).

To all whom it may concern: 1

Be it known that I, Ammo C. DnLonMn, a citizen of the United States, residing at Newark, in the county of Essex and State of ,5 New Jersey, have invented certain new' and useful Improvements in Interru ter Mechanism' for Ignition-Dynamos, which the following is a specification, reference being had to the accompanying drawing. Y. My invention relates to an improved interrupter mechanism for ignition dynamos commonly called magnetos, and has for its object the improvement thereof in such malnner as 'to increase the eflicienc and, at the "e time, lengthen the life 0 the contacts axidjtheir operating parts, and tocbviate certain difiiculties which have 'heretofoi'e arisen through thehigh speeds of. operation of'some of theseparts, and to reduce sparkatthecontacts. e. errangementcommonlyemployed in magnetds of the high tension jump spark type has been to provide a pair of contacts in the ihterrupter with stem opening the "some at theproper poi t on the E. M. F. vfvave-"inthe generating coil, so as to render fthe secondary discharge circuit operative for an instant; 'nie'thod has 1 been found satisfactory," but 'nrherethe-cam moves at high speeds,-as is thec'as' "when the magneto is employed with 'in'odern 8 'and 12'cylinder-high speed engines, the interrupter contacts will'open and 'closessoften as 12,000 times per minute, so

will make about 24,000 movements per 1minute, or 400 per second .Owing to the rapidity with which, the lever movements "follow each other,

continuous and, a very heavy spring must employed to secure the proper length of "dwell ofv thecontacts.

Under the conditions stated it cannotbe that the contact leversandxconta'ctswill be either highly eflicient or long- 7 lived,,and1 eliminate.. many oi these objec- 'ftions incident to the employment of a single and lever by employing .156 i'apidl'y fasone would be forced to do.

sin-well aware that it is not new to proof screws 22 passing studs projecting 11 For ordinary-- speeds this that .the lever carrying the moving contact theaction is practically 180 degree cam is used the mechanismgvvi two levers 'ing, IX-the primary win ',;'.".w rhereby the levers need only vibrate half as vide an interrupter with more than one pair of contacts, or with more than one contact lever. I am not aware, however, of any invention in which a plurality' of contacts'or of levers have been arranged to operate in the manner and for the purpose of my in yention, which it will be observed is applied directly to the magneto primary circuit, no battery or'externel coil connections being necessary. f In-the accompanying fi ure the numerals"v 5 and 7 denote separate Erackets or anvilsi which are secured to the casing 1 by means through insulating bushings 21. Suitable insulation 18 is placed underneath the brackets between 'then and the casing.

The brackets carry screws 193ml 20 miting contact points 24: and 26 adapted to engage the contacts 23 and in the icy Land 6. A i I11;

Levers 4 and 6 are pivoted at 15"and1'lbn wardly from the l'bafse, and have in the en s opposite to the Contact points suitable fiber bumpers 10 and" 11 adapted, to engage the rotatable cai'n li mounted on the-niagneto shaft in anyivell known manner. If It will be observed that the leversiifla'nd 6 lie in the same;plane, and are held ontheir studs by the spring clip 13, the indentations 14 and mitt-which will fitover loand' 17.

Piece 13is n mally turned to the' left from the osition s own in thedrawingf T e entire casing I is usually moi ia ble about the cam 12 for timing purposes an'd it suitable projection on handle 2,- is pi'crvi'de whereby said casing may be connecte to the usual sparlcadvarice lever. The hap may be connected at any suitable point, as 2% The angle between the center lines of the bumpers is 90 degrees, in which case, when {I A l i break thegcircuit of the cam. Y, 29 denotes the core otthe magnetoflyvindding thereon, and 28 the secondary winding. Instead of oneend, of the'priinar'y winding being'connect-cd A four times per revo the frame of the. machine denoted at h each lever and to the casing. so the electrical circuit is not completed through the pivots of the levers.

A condenser 36 may be connected across the primary winding, and one end of the secondary winding is usually connected tothe rotating distributer linger 30 of the high tension distributer 35 and makes contacts with the points 31, 32, 33 and 3'4 suitably connected to the various spark plugs as indicated. 30 s timed to rotate and contact with the plug points in synchronism with thg operation of the interrupter contacts.

Inop ration, the cam 12 being rotated, it will be noted that first lever 4 and then lever 6 will break contact, thereby opening first one and then the other end of the primary finding. his arrangement divides the wor of breaking the circuit between the twolevers which at high speed facilitates that functior, because each lever is moved half as fast as in the case of a singleiever, which would be actuated by a it-lobed cam. It will 'be'noted I employ a 2-lobed cam of sim le construction and less liable to wear.

aving thus described my invention, I claim 1. An interrupter for ignition dynamos comprising a pair of interrupter levers and a single cam for causing said levers to alternately and independently open the same circuit.

2. An interrupter for ignition generators comprising a pair of interrupter levers elecqtrically connected together, and asingle cam for actuating said lovers to alternately and independently open the same circuit.

3. An interrupter for ignition generators comprising a casing, a pair of brackets sc cured to said casing insulated therefrom and from each other and carrying contacts. a pair of interrupter levers carrying contacts adaptedgto engage said first mentioned contacts, a single cam for opcrating said levers alternately and independently, and a circuit including all of said contacts in series. substantiallly as described.

.4. An interrupter for ignition cnerators comprising a pair of pivoted levers, a casing supporting said levers, and a single member securedwto} said casing and adapted to hold sai levers in place thereon, substantially as described.

5. An interrupter for ignition dynamos comprising a pair of pivoted levers, a casing supporting said lovers. a substantially V- shaped member secured to said casing and adapted to hold said levers thereon. a single cam for positively operating, said levers positioned between the latter, contacts carried by said levers, and separately insulated contacts adapted to engage said lever contacts, said latter contacts connected in series in a. circuit, substantially as described.

6. In an ignition dynamo, a pair of levers carrying contacts, a pair of fixed contacts engaging said lever contacts and normally insulated from each other whereby allof said contacts are in series, a supporting frame work, a generating core and primary winding thereon, and connections between said primary winding and said stationary contacts, substantially as described.

7. In an ignition dynamo, a generating coil having a primary and secondary winding, a core therefor, an interrupter body movable for timing purposes, a pair of contacts carried on said body and insulated therefrom and from each other, connections between the ends of said primary winding and said contacts, a pair of interrupter levers adapted to engage said contacts. a single cam for operating said levers, and a distributer connected tothc free end of said secondary winding and adapted to be operated in unison with said cam for the purpose specified, substantially as described.

8. An interrupter for ignition systems,

comprising a plurality of relatively stationary contacts, and cotlperating circuit breaking pivoted levers, arranged around a central axis, a normally closed circuit, including said levers and coiiperating contacts arran ed therein in series, and a cam. rotatable about said axis, having a cam point adapted to close said circuit. as many times as there are levers, during each revolution of the cam. 9. An interrupter for. ignition systems, comprising a pair of normally closed contact devices placed around a central axis, 90 apart, a circuit in which said devices are arranged in series and a cam. having elevations 180 apart, rotatable-about said axis to break said circuit by successive cngagement with said contact devices.

10. An interrupter for ignition dynamos comprising a pair of interrupter levers and a cam means fcrcausing said lovers to alternately and independently open the same cir cnit.

11. An interrupter for ignition generators from each other and carrying contacts, a' In testimony whereof I hereunto aflix my pair of interrupter levers can-yin contacts signature in the presence of two witnesses.

adapted to engage said first mentioned 0on ALFRED CHINA DE .fEORME. tacts, a cam means for operating said levers Witnesses: 5 alternejtely and independently, and a circuit G.'H. SASS,

including all of said contacts in series. GARLT. MASON. 

